Edit > Check Balance (Mathematica Menu Item)

Check Balance expands the selection to cover the nearest pair of matched bracketing characters.

Edit > Check Spelling... (Mathematica Menu Item)

Check Spelling opens the Check Spelling dialog box and searches for misspelled words.

Format > Clear Formatting (Mathematica Menu Item)

Clear Formatting removes formatting from selected text or cells.

Edit > Clear (Mathematica Menu Item)

Clear deletes a selection without pasting it to the clipboard.

File > Close All (Mathematica Menu Item)

Close All closes all open notebooks (Windows only).

Cell > Grouping > Close All Subgroups (Mathematica Menu Item)

Close All Subgroups closes all groups in a selection.

File > Close (Mathematica Menu Item)

Close closes the current notebook.

Cell > Grouping > Close Unselected Cells (Mathematica Menu Item)

Close Unselected Cells closes all groups but leaves selected cells open.

Insert > Color… (Mathematica Menu Item)

Color opens a dialog for choosing a color.

Edit > Complete Selection (Mathematica Menu Item)

Complete Selection completes a partially typed function name.